CN111198086A - Vibration testing method applied to multistage series energy storage module - Google Patents
Vibration testing method applied to multistage series energy storage module Download PDFInfo
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Abstract
The invention belongs to a vibration test method of high-voltage equipment, and provides a vibration test method applied to a multistage series energy storage module for solving the technical problems. Aiming at the multi-stage series energy storage modules, under the condition of not carrying out the whole machine test, related parameters of the vibration test are firstly obtained through modeling simulation, and then the single energy storage module is respectively tested, so that the structural strength and the connection stability of internal components of the single energy storage module can be comprehensively checked in the development stage of the single energy storage module, the development period of the energy storage module is shortened, and the test cost is reduced.
Description
Technical Field
The invention belongs to a vibration test method of high-voltage equipment, and particularly relates to a vibration test method applied to a multistage series energy storage module.
Background
As shown in fig. 1, in some high voltage devices, a plurality of energy storage modules are connected in series at the central axis of a cylindrical outer cylinder 04 of the device, wherein a head module 03 is connected with a baffle 01 at one end of the outer cylinder 04 through a head base 02, a tail module 06 is connected with the baffle 01 at the other end of the outer cylinder 04 through a tail base 07, and the rest of the energy storage modules are connected with the head module 03 and the tail module 06 in series and overlapped with each other. In the high-voltage equipment, the energy storage module adopts a connection mode of supporting at two ends and suspending in the middle, so that the energy storage module at the suspending part in the middle is a weak part of the structural mechanics of the whole high-voltage equipment, particularly the middle module 05.
Before practical application, the high-voltage equipment needs to be subjected to a vibration test according to the mechanical weak point of the high-voltage equipment and the requirements of specific use environment conditions so as to verify whether the structure of the multi-stage series energy storage module can bear the use environment, including the dynamic conditions required by final assembly, transportation and the like. Generally, after the equipment is assembled and integrated, a sinusoidal vibration test is conducted on the whole machine to verify the structural safety of the equipment, particularly the multi-stage series energy storage module.
The universal vibration test method has the advantages that the structure of the equipment comprising the multi-stage series energy storage module can be comprehensively examined, but the following defects exist: (1) the method is characterized in that the test can be carried out only after the parts of the equipment, including a plurality of energy storage modules, are completely assembled, and the test can not be carried out after the design and processing of a single energy storage module are finished, so that the test can not be carried out in an early stage and the design defects of the energy storage modules can not be found in time; (2) the energy storage modules are core components of the whole equipment, and the plurality of energy storage modules are tested after all the energy storage modules are put into production, so that if the structure has a safety problem, all the energy storage modules are unavailable, and the test cost is high; (3) the mode positions the overall test as the dual property of examination and verification, is not in line with the single machine product development process, the energy storage module is used as a complete single machine, the single machine examination test is generally carried out on a single energy storage module, and the subsequent overall test is only used as the verification property.
The invention discloses a method for testing virtual sine vibration of a spacecraft, which considers all key links of a real vibration test of the spacecraft, can replace the real whole-satellite sine vibration test in theory and can save the test cost, but is only a simulation vibration test, and the reliability of the test result needs to be improved.
Disclosure of Invention
The invention mainly aims to solve the technical problems that structural safety verification of high-voltage equipment in the prior art is mostly realized by carrying out a vibration test on a complete machine after equipment assembly and integration are finished, so that design defects of a single energy storage module cannot be found as soon as possible, the test cost is high, and the single-machine product research and development process is not met, and meanwhile, the conventional method for replacing the complete machine vibration test by utilizing simulation verification is insufficient in reliability, and provides a vibration testing method applied to a multistage series energy storage module.
In order to achieve the purpose, the invention provides the following technical scheme:
a vibration testing method applied to a multi-stage series energy storage module is characterized by comprising the following steps:
s1, modeling
Establishing a complete machine finite element model of the high-voltage equipment, wherein the screw connection positions between adjacent energy storage modules, the screw connection positions between the head energy storage modules and the head base and the screw connection positions between the tail energy storage modules and the tail base are all modeled according to beam units;
s2, carrying out high-voltage equipment whole machine sine vibration simulation
S2.1, according to the high voltage equipment working ringSetting the start frequency omega of the sinusoidal vibration at the center of the head and tail bases connected to the two ends of the high voltage equipment0Sine vibration end frequency omegatAnd system damping ratio ξ;
s2.2, performing radial sinusoidal vibration simulation, and comparing to obtain the maximum radial response acceleration value a in the head energy storage module, the tail energy storage module and the middle energy storage modulemAnd corresponding first order frequency ωm；
S2.3, obtaining the first-order frequency omega of all beam units of the head energy storage module and the head basemMaximum axial force fzMaximum shearing force fτAnd bending moment M relative to the center of the modules；
S2.4, obtaining the first-order frequency omega of all beam units of the tail energy storage module and the tail basemMaximum axial force fz', maximum shearing force fτ' and bending moment M with respect to the center of the modules′；
S2.5, comparing M in step S2.3 and step S2.4 respectivelysAnd Ms', taking MsAnd MsThe larger value of M is introduced into M, and the equivalent axial load f equivalent to the bending moment M is calculateds：
Wherein n is the number of beam units, if Ms＞Ms' the number of beam units between the head energy storage module and the head base is ' zero '; if M iss＜Ms' the number of beam units between the tail energy storage module and the tail base is ' zero '; r is the radius of a reference circle of a screw at the joint of the energy storage module corresponding to n and the corresponding base;
s2.6, carrying out axial sinusoidal vibration simulation to obtain the axial maximum response acceleration a in all energy storage modulesm', corresponding first order frequency value omegam' and maximum axial force fz″′；
S2.7, obtaining the maximum axial force f of the beam unit between the adjacent energy storage modulesz", maximum shearing force fτ"and maximum bending moment MsCalculating the bending moment Ms"equivalent axial compressive load fs″，
Wherein n 'is the number of beam units between adjacent energy storage modules, and R' is the radius of a reference circle of a connecting screw between adjacent energy storage modules;
s3, obtaining the maximum axial load and the radial shearing force of the high-voltage equipment beam unit, namely the maximum axial force and the maximum shearing force
S3.1, comparison fz、fz′、fs、fz"' and fsTaking the maximum value as the maximum value of the axial force;
s3.2, comparison fτ、fτ' and fτTaking the maximum value as the maximum value of the shearing force;
s4, carrying out single energy storage module structure test
S4.1, mounting a balancing weight above the single energy storage module, wherein the balancing weight has the mass of
Wherein k is the system elastic coefficient;
s4.2, mounting the energy storage module provided with the balancing weight on a vibration test board through a flange plate;
s4.3, performing vibration test, wherein the joint of the energy storage module and the flange plate reaches the maximum axial force and the maximum shearing force during the test;
s5, testing the internal connection relation of the single energy storage module
S5.1, designing and manufacturing an L-shaped mounting plate, wherein the L-shaped mounting plate comprises a vertical part and a horizontal part, and a triangular supporting plate is arranged between the vertical part and the horizontal part of the L-shaped mounting plate;
s5.2, mounting a single energy storage module on the vertical part of the L-shaped mounting plate, and mounting the horizontal part of the L-shaped mounting plate on the vibration test board;
s5.3, respectively carrying out full-band acceleration values of a on a single energy storage modulemThe radial vibration test and the full-band acceleration value are am' axial vibration test;
s6, if the energy storage module is not damaged under the maximum axial force and the maximum shearing force in the step S4.3 and the internal connection relation is not damaged under the radial vibration test and the axial vibration test in the step S5.3, the design of the energy storage module reaches the standard; otherwise, adjusting the design of the energy storage module and testing again.
Further, in step S1, the establishing of the complete finite element model of the high voltage device is performed by using the mscs.
Further, the step S2.1 is specifically to set a sinusoidal vibration input control point by using msc.nanostran software according to the dynamic conditions of the working environment of the high voltage device, the control point being respectively the center of the head base and the tail base connected to both ends of the high voltage device, and then set the start frequency ω of sinusoidal vibration0Sine vibration end frequency omegatAnd a system damping ratio ξ.
Further, in step S4.3, the maximum axial force and the maximum shear force at the connection between the energy storage module and the flange during the test are specifically achieved;
s4.3.1, establishing a single energy storage module structure test model, wherein the screw connection part of the energy storage module and the flange is a beam unit;
s4.3.2, performing radial frequency sweep simulation to obtain an initial frequency sweep magnitude, and obtaining the axial force and the bending moment applied to the beam unit between the energy storage module and the flange plate under the initial frequency sweep magnitude;
s4.3.3, obtaining a according to the linear estimation of the initial sweep frequency magnitudeHAdjusting the magnitude of the sweep frequency to aHOr stepwise adjustment of the swept magnitude to aHSo that the beam unit between the corresponding energy storage module and the flange plate is subjected to axial force
And shear force
Respectively reaching the maximum axial force and the maximum shearing force; wherein
Further, step S4.3.2 includes sweeping the frequency to obtain the corresponding first-order frequency, and determining whether the frequency is ωm±5％ωmIf the vibration is within the range, continuing the vibration test; otherwise, after the mass of the balancing weight is adjusted, the vibration test is carried out again until the balancing weight falls into the range.
Further, in step S4.3.2, the initial frequency sweep is on the order of 0.1 g.
Further, in step S4.1, the system elastic coefficient k is a constant and takes the value of 10e5Magnitude.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the vibration testing method, for the multi-stage series energy storage modules, under the condition that a complete machine test is not carried out, relevant parameters of the vibration test are obtained through modeling simulation, and then the single energy storage module is tested respectively, so that the structural strength and the connection stability of internal components of the single energy storage module can be comprehensively checked in the development stage of the single energy storage module, the development period of the energy storage module is shortened, and the test cost is reduced. When the structural strength of a single energy storage module is tested, the maximum bearing capacity of the single module can be equivalently checked when the whole machine of the multi-stage series energy storage module vibrates only by carrying out a radial vibration test on the single module with the balance weight. The connection stability of the internal components of the single energy storage module is checked, the energy storage module is arranged on a vibration test platform through the designed L-shaped mounting plate, an axial vibration test and a radial vibration test can be carried out, the connection stability between the internal components of the single energy storage module can be checked under the full-band maximum acceleration, and the influence of the maximum acceleration on the single module on the connection relation stability of the internal components of the single energy storage module during the vibration of the whole multi-stage series energy storage module is comprehensively and equivalently checked. The assessment method is simple and feasible, and the result is accurate and reliable.
2. The invention uses Msc.Patran software for modeling, uses MSC.Nastran software to input a control point of sinusoidal vibration, takes the centers of head and tail bases at two ends of high-voltage equipment as control points, and accurately controls the control points through related software.
3. When the single energy storage module is subjected to structural test, the frequency is swept by 0.1g, the bending moment and the radial shear force under the frequency are extracted, the frequency sweeping magnitude is calculated under the condition of meeting the requirements of axial force and shear force, and the operation is simple and easy.
Drawings
Fig. 1 is a schematic structural diagram of a multi-stage series energy storage module in a high voltage device;
in fig. 1: 01-baffle, 02-head base, 03-head module, 04-outer cylinder, 05-middle module, 06-tail module, and 07-tail base.
FIG. 2 is a schematic diagram of the energy storage module tested in the present invention;
FIG. 3 is an assembly diagram illustrating structural testing of a single energy storage module according to the present invention;
FIG. 4 is an assembly diagram illustrating a single energy storage module internal connection test according to the present invention;
FIG. 5 is a schematic flow chart of the present invention;
in fig. 2 to 4: 1-energy storage module, 2-balancing weight, 3-flange plate and 4-L-shaped mounting plate.
Detailed Description
The technical solution of the present invention will be clearly and completely described below with reference to the embodiments of the present invention and the accompanying drawings, and it is obvious that the described embodiments do not limit the present invention.
As shown in fig. 2 to 4, in the vibration testing method of the present invention, a finite element model of the whole high voltage device needs to be constructed first, and in the process, screws between the single energy storage modules 1 are modeled according to beam units; then, carrying out radial and axial vibration simulation on the whole machine; on the basis, the maximum axial load and the radial shear force borne by the connecting screw between the adjacent energy storage modules 1 are obtained through comparison, the structural check of the single energy storage module 1 in a counterweight adding mode is designed according to the result, and the structural safety of the single energy storage module 1 is verified; and finally, comparing the axial acceleration value and the radial acceleration value to obtain the maximum axial acceleration value and the maximum radial acceleration value on the energy storage module 1 in the axial simulation process and designing the L-shaped mounting plate 4 according to the acceleration values to check the internal connection relation of the single energy storage module 1 so as to verify the safety of the connection relation between the internal components of the single energy storage module 1.
The application object of the invention is high-voltage equipment, the 12-level series energy storage module 1 is connected with the baffle of the outer cylinder through the head base and the tail base, the 12-level series energy storage module 1 is positioned at the central axis of the outer cylinder of the high-voltage equipment and is coaxial with the outer cylinder, and the 12-level series energy storage module 1 is in a mode that the two ends of the 12-level series energy storage module are supported and the middle part of the 12-level series energy storage module is suspended, so the 12-level series energy storage module 1 is a. When the whole machine is subjected to an axial vibration test, vibration excitation is applied to the 12-stage series energy storage modules through the bases at the two ends, and acceleration responses of different magnitudes can exist between the modules in the axial direction and the radial direction; when the whole machine is subjected to radial test, the 6 th and 7 th stages of the 12-stage series energy storage module 1 as the middle module may have larger radial acceleration response, which is a challenge to the safety of the connection structure of the head module and the tail module.
As shown in fig. 5, based on the above-mentioned connection structure of the multi-stage series energy storage modules inside the high voltage device, the vibration test method provided by the present invention is implemented according to the following steps:
(1) establishing a complete machine finite element model of the high-voltage equipment by using Msc.Patran software, and modeling a screw joint between the energy storage modules, a screw joint between the head energy storage module 1 and the head base and a screw joint between the tail energy storage module 1 and the tail base according to a beam unit in the process;
(2) simulation of radial sinusoidal vibration of high-voltage equipment complete machine
Because the high-voltage equipment is in a circumferential symmetrical structure, radial vibration simulation is carried out; setting a sinusoidal vibration input control point by using Msc.Nastran software, wherein the sinusoidal vibration input control point is respectively arranged at the center of a head base and a tail base which are connected with baffles at two ends of high-voltage equipment;
setting the sine vibration full-frequency-band acceleration input value as 6g and the sine vibration initial frequency omega05Hz, sine vibration end frequency omegatCarrying out radial sinusoidal vibration simulation, recording and comparing radial acceleration response at the outer circle of the 12-level energy storage module 1 to obtain a maximum radial response acceleration value amOccurring at the middle 6 th or 7 th stage energy storage module 1, the response value is recorded as amApproximately 24g, recorded as ω corresponding to the first order frequencym≈80Hz；
Recording and comparing the maximum axial force and the maximum shearing force at the connecting beam unit of all the energy storage modules 1 and the bending moment of the beam unit relative to the center of the module to obtain the maximum values of the three parameters which are all corresponding to the head module, namely the maximum values at the first-order frequency omegamLower maximum axial force of fzMaximum shear force of fτMaximum bending moment at the center of the relative module is MsWill MsSubstituting M in the formula:
wherein n is the number of beam units, and R is the radius of a reference circle of a screw at the joint of the head energy storage module 1 and the head base.
Calculating the maximum bending moment MsCorresponding equivalent axial compressive load fs(ii) a Simultaneously comparing the maximum axial forces fzEquivalent axial pressure load fsTaking the larger value as the basis of subsequent design;
(3) axial sinusoidal vibration simulation of whole high-voltage equipment
Carrying out axial vibration simulation, and setting sinusoidal vibration input control points which are respectively the centers of a head base and a tail base connected to baffles at two ends of high-voltage equipment by using Msc.
Setting the sine vibration full-frequency-band acceleration input value as 6g and the initial frequency omega05Hz, end frequency omegat200Hz and the system damping ratio ξ is 0.03, recording and comparing the axial acceleration response at the excircle of the 12-stage module, obtaining the axial maximum response acceleration value, and recording as am', the corresponding first order frequency being recorded as ωm', the maximum axial force is fz″′；
Recording and comparing the maximum axial force and the maximum shearing force of all the energy storage module connecting beam units and the bending moment of the beam units relative to the module center, wherein the maximum value occurs in a frequency value omegam' hereinafter, the maximum axial force is fz", maximum shear force is fτMaximum bending moment of Ms"; according to the following formula:
wherein n 'is the number of beam units between adjacent energy storage modules 1, and R' is the pitch circle radius of the connecting screw between adjacent energy storage modules 1.
Calculating to obtain the maximum bending moment Ms"corresponding equivalent axial compressive load fs"; simultaneously comparing the maximum axial forces fz"and equivalent axial compressive load fsTaking the larger value as the basis of subsequent design;
(4) comparing to obtain the maximum axial load and radial shear force on the beam unit in the simulation process of radial and axial sinusoidal vibration of the whole machine
Comparing the axial maximum force and the radial maximum force of the beam units between the modules in the third step, and recording corresponding frequency values as the basis of subsequent design; the maximum force of the obtained axial acting force is the equivalent axial pressure load fsCorresponding to a frequency of ωmCorresponding bending moment of Ms(ii) a The maximum force of the radial acting force is a radial shearing force fτCorresponding to a frequency also of omegam；
(5) Comparing to obtain the maximum axial and radial acceleration values on the energy storage module in the simulation process of radial and axial sinusoidal vibration of the whole machine
Obtaining the maximum radial acceleration value a of all energy storage modules 1 of the whole machine during radial vibrationm(ii) a The maximum axial acceleration value of all modules of the whole machine during axial vibration is am′；
(6) Performing a single energy storage module structure examination test
Obtaining the maximum axial pressure load f according to the step (4)sMaximum bending moment of MsMaximum radial shear force fτAnd designing a single-ended excitation assessment test of the single-module structure. As shown in fig. 3, in the experiment, a balancing weight 2 is installed above an energy storage module 1, and then the energy storage module 1 with the balancing weight 2 is fixedly installed on a vibration test platform through a flange 3 to perform radial, i.e. horizontal vibration test in the ox direction in the figure, so that a single energy storage module 1 can realize that the first-order frequency is ω in the vibration modemAnd the maximum bending moment M is achieved at the connecting screw position of the single energy storage module and the flange plate 3sAnd maximum radial shear force fτ；
Mass m of counter weight 2 can be according to formula
And calculating, wherein k is the system elastic coefficient, and generally adopting a dynamic simulation mode of the test mode to evaluate and select.
Establishing a finite element model of a single-end excitation examination test system with a single-module structure, wherein the energy storage module 1 is connected with a flange plate 3 through screws to form a beamFirstly, sweep frequency 0.1g to verify whether the corresponding first-order frequency is omegam±5％ωmWithin the range, if the mass of the adjustable balancing weight 2 is not in the range until the mass falls into the range, the first-order frequency is simulated to be omegamThe specific value of the time-frequency balancing weight 2 and the bending moment of the frequency at the magnitude
And radial shear force
Calculating the frequency sweep magnitude a which should be reached by the single-end excitation examination test of the single-module structure according to the proportionHOr increasing the magnitude of the sweep step by step until the frequency is changed
And
respectively greater than or equal to the maximum value of the shear force and the maximum value of the axial force, and the magnitude of the sweep frequency at the moment is recorded as aH(ii) a Wherein the content of the first and second substances,
and
respectively, the swept frequency magnitude aHThe maximum shearing force and the maximum bending moment applied to the beam unit between the lower corresponding energy storage module 1 and the flange 3. Completing a structure assessment test on the single energy storage module 1;
(7) test for checking internal connection relation of single energy storage module 1
′
Obtaining the maximum radial acceleration a of the whole machine during vibration according to the fifth stepmAnd axial acceleration value amAn L-shaped mounting plate 4 is designed as shown in FIG. 4, wherein the horizontal part of the L-shaped mounting plate 4The single energy storage module 1 is arranged on a vibration test platform, and a vertical part of the L-shaped mounting plate 4 is provided with the single energy storage module 1; the L-shaped mounting plate 4 is utilized to carry out full-band acceleration value a on a single energy storage module 1mOn the basis of the radial vibration, i.e. the ox direction, the full-band acceleration a of the individual energy storage modules 1 is achievedmThe axial vibration, namely the oz direction, can realize the examination of the stability of the connection structure between the components in the module in the development stage of a single energy storage module 1.
If through the above test, the connection structure of a single energy storage module 1 is not damaged under the maximum shearing force and the maximum bending moment in the structural test, and the connection relation of internal components is not damaged under the axial vibration and radial vibration test in the internal connection relation test, the single energy storage module 1 passes the test, the design is good, if any one or two of the internal components do not pass the test, the design of the energy storage module 1 needs to be improved, the design defect can be found in time, and the research and development and production cost is effectively reduced.
The above description is only an embodiment of the present invention, and is not intended to limit the scope of the present invention, and all equivalent structural changes made by using the contents of the present specification and the drawings, or applied directly or indirectly to other related technical fields, are included in the scope of the present invention.
Claims (7)
1. A vibration testing method applied to a multi-stage series energy storage module is characterized by comprising the following steps:
s1, modeling
Establishing a complete machine finite element model of the high-voltage equipment, wherein the screw connection part between the adjacent energy storage modules (1), the screw connection part between the head energy storage module (1) and the head base and the screw connection part between the tail energy storage module (1) and the tail base are all modeled according to a beam unit;
s2, carrying out high-voltage equipment whole machine sine vibration simulation
S2.1, setting the sine vibration initial frequency omega at the center of the head part base and the center of the tail part base connected to the two ends of the high-voltage equipment according to the dynamic conditions of the working environment of the high-voltage equipment0Sine vibration end frequency omegatAnd system damping ratio ξ;
s2.2, performing radial sinusoidal vibration simulation, and comparing to obtain the maximum radial response acceleration value a in the head energy storage module (1), the tail energy storage module (1) and the middle energy storage module (1)mAnd corresponding first order frequency ωm；
S2.3, obtaining the first-order frequency omega of all beam units of the head energy storage module (1) and the head basemMaximum axial force fzMaximum shearing force fτAnd bending moment M relative to the center of the modules；
S2.4, obtaining the first-order frequency omega of all beam units of the tail energy storage module (1) and the tail basemMaximum axial force fz', maximum shearing force fτ' and bending moment M with respect to the center of the modules′；
S2.5, comparing M in step S2.3 and step S2.4 respectivelysAnd Ms', taking MsAnd MsThe larger value of M is introduced into M, and the equivalent axial load f equivalent to the bending moment M is calculateds：
Wherein n is the number of beam units, if Ms＞Ms', the number of beam units between the head energy storage module (1) and the head base is shown; if M iss＜Ms' the number of beam units between the tail energy storage module (1) and the tail base is ' zero '; r is the radius of a reference circle of a screw at the joint of the energy storage module (1) corresponding to n and the corresponding base;
s2.6, carrying out axial sinusoidal vibration simulation to obtain the axial maximum response acceleration a in all the energy storage modules (1)m', corresponding first order frequency value omegam' and maximum axial force fz″′；
S2.7, obtaining the maximum axial force f of the beam unit between the adjacent energy storage modules (1)z", maximum shearing force fτ"and maximum bending moment MsCalculating the bending moment Ms"equivalent axial compressive load fs″，
Wherein n 'is the number of beam units between adjacent energy storage modules (1), and R' is the radius of a reference circle of a connecting screw between adjacent energy storage modules (1);
s3, obtaining the maximum axial load and the radial shearing force of the high-voltage equipment beam unit, namely the maximum axial force and the maximum shearing force
S3.1, comparison fz、fz′、fs、fz"' and fsTaking the maximum value as the maximum value of the axial force;
s3.2, comparison fτ、fτ' and fτTaking the maximum value as the maximum value of the shearing force;
s4, carrying out structural test on single energy storage module (1)
S4.1, mounting a balancing weight (2) above a single energy storage module (1), wherein the balancing weight (2) has the mass
Wherein k is the system elastic coefficient;
s4.2, installing the energy storage module (1) provided with the balancing weight on the vibration test board through a flange plate (3);
s4.3, performing vibration test, wherein the joint of the energy storage module (1) and the flange plate (3) reaches the maximum axial force and the maximum shearing force during the test;
s5, testing the internal connection relation of the single energy storage module (1)
S5.1, designing and manufacturing an L-shaped mounting plate (4), wherein the L-shaped mounting plate (4) comprises a vertical part and a horizontal part, and a triangular supporting plate is arranged between the vertical part and the horizontal part of the L-shaped mounting plate (4);
s5.2, mounting the single energy storage module (1) on the vertical part of the L-shaped mounting plate (4), and mounting the horizontal part of the L-shaped mounting plate (4) on a vibration test bench;
S5.3, respectively carrying out full-band acceleration values of a on a single energy storage module (1)mThe radial vibration test and the full-band acceleration value are am' axial vibration test;
s6, if the energy storage module is not damaged under the maximum axial force and the maximum shearing force in the step S4.3 and the internal connection relation is not damaged under the radial vibration test and the axial vibration test in the step S5.3, the design of the energy storage module reaches the standard; otherwise, adjusting the design of the energy storage module and testing again.
2. The vibration testing method applied to the multi-stage series energy storage module as claimed in claim 1, wherein in step S1, the whole finite element model of the high voltage device is modeled by using the msc.
3. The vibration testing method applied to the multi-stage series energy storage module as claimed in claim 2, wherein the step S2.1 specifically comprises, according to the dynamic conditions of the working environment of the high voltage equipment, setting a sinusoidal vibration input control point by using msc0Sine vibration end frequency omegatAnd a system damping ratio ξ.
4. The vibration testing method applied to the multi-stage series energy storage module as claimed in claim 3, wherein in step S4.3, the maximum axial force and the maximum shearing force at the joint of the energy storage module (1) and the flange (3) are achieved during the test;
s4.3.1, establishing a single energy storage module (1) structure test model, wherein the screw connection part of the energy storage module (1) and the flange plate (3) is a beam unit;
s4.3.2, performing radial frequency sweep simulation to obtain an initial frequency sweep magnitude, and obtaining the shearing force and the bending moment applied to the beam unit between the energy storage module (1) and the flange plate (3) under the initial frequency sweep magnitude;
s4.3.3, according to the initial sweep frequency quantity lineBy sexual conjecture to obtain aHAdjusting the magnitude of the sweep frequency to aHOr stepwise adjustment of the swept magnitude to aHSo that the beam unit between the corresponding energy storage module (1) and the flange plate (3) bears the axial force
And shear force
Respectively reaching the maximum axial force and the maximum shearing force; wherein
5. The method as claimed in claim 4, wherein the step S4.3.2 further comprises sweeping the frequency to obtain the corresponding first order frequency, and determining whether the frequency is ω or notm±5％ωmIf the vibration is within the range, continuing the vibration test; otherwise, after the mass of the balancing weight (2) is adjusted, the vibration test is carried out again until the balancing weight falls into the range.
6. The vibration testing method applied to the multi-stage series energy storage module as claimed in claim 4, wherein in step S4.3.2, the magnitude of the initial frequency sweep is 0.1 g.
7. The vibration testing method applied to the multi-stage series energy storage module as claimed in claim 6, wherein in step S4.1, the system elastic coefficient k is constant and takes a value of 10e5Magnitude.
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